Device for the automatic stoppage of spiral springs



E. FARAGGI Oct. 13

DEVICE EOR THE AUTOMATIC STOPPAGE OF SPIRAL SPRINGS Filed Dec. 22, 1921 2 Sheets-Sheet 1 J g g E. FARAGGI DEVICE FOR THE AUTOMATIC STOPPAGE OF SPIRAL SPRINGS Filed Dec. 22, 1921 2 Shoots-Sheet 2 ratchet wheel, and secondly, the removal of Patented Oct. 13, 1925.

UNITED STATES ERNEST FARAGGI, 0F PARIS, FRANCE.

DEVICE FOR THE AUTOMATIC STOPIAGE OF SPIRAL SPRINGS.

Application filed December 22, 1921. Serial No. 524,279.

T 0 all whom it may concern:

Be it known that I, ERNEST FARAGGI, a citizen of France, residing at Paris, 6 Avenue du Pont de Flandre, France, have invented certain new and useful Improvements in Devices for the Automatic Stoppage of Spiral Springs, of which the following is a specification.

My invention relates to'devices which are employed in combination with apparatus for the automatic mechanical Winding of a spring, for the automatic stoppage of the winding of the said spring upon reachlng the desired tension. Known'apparatus are in use wherein the mechanical winding of a spring is effected by means of a pawl havlng a reciprocating movement, mounted for instance upon a swinging control arm, and co-operating with aratchet wheel adapted to draw along in its rotation one end of the spiral spring whereof the other end is stationary. Various devices for the automatic stoppage of the winding have been constructed or proposed for use with the sa d apparatus, but the known devices of this class present the drawback of an unreliable operation and are subject to fallures whereby the winding will be continued beyond the limiting position, thus causing the breakage of the spring.

This invention has for itsobject a device for the automatic stoppage of the winding movement wherein a reliable and exact operation is obtained. lt is principally charac terized by the dispositions employed and by the suitable configurationof the ramps of a lever used to arrest the winding movement'whereby this-stoppage shall takeplace in two stages; firstly, the disengagement of the winding pawl fromthe co'rrespondlng the arm orlike support of the pawl to a distance from the member controlling the same and itsmaintenance in fixed position at a distance from thesaid member. Another essential characteristic of the invention consists in the fact that the portion or ramp of the lever adapted to arrest the winding operation and effecting the release of the pawl from the ratchetwheel, shall present such configuration with reference to the heel of the said pawl "that the pawl shall be maintained out of engagement with said wheel (even though the member carry ing the said pawl and effecting a reciprocat movement should not be stopped and should continue this movement) in all positions of the oscillating movement of the said supporting member.

The accompanying drawing shows by way of example an embodiment of this invention as applied to an apparatus for the mechanical winding of a spring by a shaft actuated by an internal combustion engine, the said spring being disposed in such manner as to'efi'ect the starting of the said engine at a subsequent period by the expansion of the same which is controlled by hand. I

Fig. 1 is a front View with the cover of the casing removed, showing the position of the mechanical parts at the commencement of the winding of the spring. Fig. 2 is a partial view similarto Fig. 1, showing the position of the parts shortly before the stoppage of the winding and when the stop lever has entered in contact with a cam rotating with the ratchet wheel. Fig. 3 is a similar View, showing the position of the operation by a spring 4'. The arm 5 se-- cured to the arm 3 has disposed on the end thereof a pawl 6 which is maintained by a spring 7 in engagement with a ratchet wheel 8. The latter wheel draws with it in its rotation one end :9 ofthev spiral spring 9 which is to be wound up and whereof the other end 9" is secured to the casing of the apparatus; 10 is a retaining pawl for maintaining the spring 9 in the wound up position-until the unwindlng effect of the same is to I'beused. A; heelll which serves as an extension of the arm 5 and a. heel 12 at the end of the windingpawl 6 are so disposed as to ;co-operate with a lever 13 provided with a ramp andpivoted to the axle 14, the lever being drawn back towardsthecentre by: the; spring 14. Opposite the stop lever 13 and so disposed as tocooperate with one of the ramps; thereof is a cam 15 having two portions of different diameter in such mannerasto' form an "offset ltl, the large diameter beinggreater by anlamount atleast of the cam 15. -lated that this condition will prevail as thereof-as long as the diameter of the said s iral is reater than the lar e diameter a y z:

l he apparatus is so regulong as the last revolution in the winding of the spring has not been commenced.

(7)) The second ramp '18 isdisposed op posite the cam 15 in such manner as to bear against the large diameter portion of the said cam after the beginning of the last winding revolution, the diameter of the outer splral of the spring having now become less than the diameter of the cam.

Vhen the ramp 18 drops into the offset 16 formed on the small diameter portion of the cam '15, this sudden movement of the lever 13 will arrest the winding motion.

('0) The third ramp 21 is disposed in the planeo f the'heel 11 'of'the windingarm; the rear surface'20 of the said ramp is disengaged in order to permit the free move- 11161111 ofthe'heel 1 1 during the normal =wind- 'ing operation. Theramp'2'1 has theshape of a cii-cular arc whose centre is located at 22 (Fig il and is situated'at a certain distance from the pivot 14. I

(d) The fourth ramp '24 is constituted by a boss 19 situated opposite' the heel 12 of the winding pawl. lIt- .co op'erates with the said pawl in such manner when the ramp '18 drops intoithe offset 16 of'the cam 15, the heel 12 shall be -lifted by the ramp 2-1, thereby releasing 'the forward end '6 of the pawl from the toothedportion of the wheel 8. The :profile'of theramp 22st is 'so constituted with reference @to the shape of the heel 12thati f the said arm 3 should continue its reciprocating movement, the

heel 12 would slide upon the ramp 24:, thus '=1n'ai1itai11ing the pawl disengaged from the wheel 8iinall :thejpositions of the reciprocating member.

inthe unwound position,tl1e stop lever Will bear by means -=of the ramp thereof 17, against the outer spiral of the ;spring '9 (Fig. 1-). 'l Vhen the spring 1 approaches the end of the windingoperation and theouter turn hasa smallerdiameter thanthe large diameter of the cam -15, the ramp '18 will :enter in contact with the latter (Fig. 2)

-'the winding operation still continues, butthestop lever no longer follows the radial amovement o'f-the outer spiral of the spring,

inasmuch'as'it is held in the fixed position by the cam 15. As the rotation of the latter continued during the winding operation, .it will arrive ata point at which the small diameter portion thereof will come under the ramp 18 of the :lever .13and the latter will thus be caused to drop suddenly into the offset :16 (Fig. 3) the following will take place; firstly, the ramp 24 will lift the heel 12 of the winding ipawl .and will separate the latter from the ratchet wheel, thereby arresting the winding operation; secondly, when the arm 3 after being impelled by the eccentric 2 is brought to the left byits return spring l,-the'heel thereof 11 will enter in contact with the ramp 21. Inasmuch as the latter-has an'eccentricform, it will impel the heel 11 under the action of the stronger spring 14;, therebycausing the arm to :pivot upon its axle 4, the said-arm being thus moved to and maintained in 'a fixed position out of contact with the eccentric "2 which continues to rotate. 'Itwill be seen,:therefore,thatwhen the drive shaft :1 is rotated it will cause the actuation of the eccentric 2 which in turn will impart an alternating, oscillating movement to the lever B, which is -main- 'tained in yieldable engagement with the eccentric 2 by means of :thespring .4. The detentG, carried by the arm 5, will like- 'wise be given an alternating movement wvhile the ratchet wheel 8 will be advanced by its engagement with the-.detent 6 and is :prevented from moving backward, due to the contact of retaining pawl with the wheel '8. As the ratchet wheel isconnected to the end 9. of the spring and since the opposite end 9 is secured to tl1e-casing,.a

complete Winding of the spring will be ef- 1 "fectediby lthelrotation of the shaft 1.

A shaft has mounted thereon-a retaining pawl 10, and also a bell crank lever 31, the upper arm .of which :lever is connected "to an operating cable 22, wvhile the lower armithereof has arportion 33 adapted to enigage the adjacent faceof'the pawl 6 when thecable :32 is :moved to the right asshown in l igure 11. :Itwill lee-seen that upon the depression .of the lower arm of the lever by ".movement'o'f the cable 32, the pawl 6 will :ibe disengaged from the ratchet wheel 8, so :as to (permit the latter to rotateunder the tension of the springt).

It should be observed that the ramp 2 landtherheel12 of the pawl.have'a'suitable configuration with reference :to each other .whereby even if :the second stage of the operation were notcarriedout and the windingiarm 3 should continue to bear upon the eccentric and to be given theireciprocating imovement, the winding pawl will remain 'separatedifromthe ratchet wheel 'in all positionsofthe swing =0f arm 3, and the heel 512 will slide upon the ramp 24 withoutperill mitting the point of the pawl to return into engagement with the wheel 8.

The ramps 17 and 18 maybe formed in one or may be disposed in alignment without departing from the principle of the invention; however the separation of these two parts into two levels will facilitate the adjustment of the apparatus. In fact, after the apparatus is mounted, the levels 17 and 18 may be regulated with reference to each other for instance by filing the same, in order to adapt their spacing to that which prevails at the beginning of the last winding revolution between the outer spiral of the spring and the periphery of the large diameter part of the cam 15.

Claims 1. In a device for the automatic stoppage of the winding of a spring, the combination of a notched disc, a pawl releasing lever having a series of separate cam faces, one of which cams normally bears upon the outer turn of the spring and the other being adapted to engage said notched disc, the arrangement of the cams being such that when the spring has been wound, the first cam permits the outer cam to engage the notched disc.

2. In a device for the automatic stoppage of the winding of a spring, the combination of a notched disc, a pawl releasing lever having three separate cam faces, one of which faces normally bears upon the outer turn of the spring, the second cam surface being adapted to cooperate with the notched disc and the third cam surface adapted to cooperate with the pawl, the arrangement of the cam surfaces being such that when the spring has been wound, the first cam surface allows the second cam surface to engage with the notched disc and the third cam surface disengages the pawl from the ratchet wheel.

3. In a device for the automatic stoppage of the winding of a spiral spring, the combination of a ratchet wheel, a notched disc revoluble with said ratchet wheel, a lever having separate cam faces, one of which of the cam surfaces being such that when the spring has been wound, the first cam surface permits the other to engage the notched disc, a winding lever, and means on the cam lever for stopping oscillation of said winding lever.

4. In a device for the automatic stoppage of the winding of a spiral spring, the combination of a'ratchet wheel, a notched disc movable with said ratchet wheel, a lever having separate cam faces, one of which normally bears upon the outer spiral ofthe spring and another being adapted to engage said notched disc, the arrangement of the cam surfaces being such that when the spring has been wound, the first cam surface permits the other to engage the notched disc, a winding lever, and means on said cam lever for stopping oscillation of said winding lever, said means comprising an additi onal cam surface formed on the cam lever, the curvature of said additional cam surface being eccentric relative to the turning axis of the cam, and an arm projecting from said lever cooperating with said additional cam surface for holding the latter away from the device when the spring has been wound.

5. In a device for the automatic stoppage of the winding of a spiral spring, the combination of an oscillatory arm having a heel portion, a pawl pivoted to said arm, means yieldably holding said arm in operative position, a ratchet wheel associated with said spring, a cam member rotatable with said spring, a pawl releasing lever having a plurality of cam faces, one of said faces engaging said spring when it is substantially unwound, and another face engaging said rotatable cam member to stop rotation thereof, and a ramp on said lever engageable with said heel to hold said arm against rotation when said spring is fully wound.

In testimony whereof I affix my signature.

' ERNEST FARAGGI. 

